Chapter 6 Review

Two atoms will likely form a polar covalent bond if the electronegativity difference is which of the following Numbers?

• 0.1

• 1.0

• 2.5

• 4.0

Answer explanation

Anything less than 0.4 is non polar covalent. Anything Greater than 1.8 is ionic.

Anything that falls between 0.4 and 1.8 is a polar covalent bond

The melting points of ionic compounds are higher than the melting points of molecular compounds because why?

• ionic substances tend to vaporize at room temperature

• ionic substances are brittle

• attractive forces between ions are greater than the attractive forces between molecules

• the numbers of positive and negative charges are equal in an ionic compound

A covalent bond is formed when two atoms

• share an electron with one another

• share one or more pairs of electrons with each other

• gain electrons

• lose electrons

Bonding in molecules or ions that cannot be represented adequately by only one Lewis structure is represented by what?

• double bonding

• overlapping orbitals

• covalent bonding

• resonance structures

Which type of bonding is characterized by overlapping orbitals that allow outer electrons of atoms to move about freely throughout the entire compound?

• ionic

• covalent

• metallic

• multiple

Answer explanation

The free moving electrons in metallic bonds are what give metals their unique properties.

According to VSEPR theory, what is the shape of a molecule of CO₂?

• linear

• bent

• tetrahedral

• trigonal-planar

An ionic bond results from the electrical attraction between

• cations and anions

• atoms

• dipoles

• orbitals

The principle that states that atoms tend to form compounds in which each atom has eight electrons in its highest occupied energy level is called the

• rule of eights

• configuration rule

• Avogadro principle

• octet rule

Lattice energy is an indication of the

• strength of an ionic bond

• strength of ions in a crystal

• strength of a metallic bond

• strength of a covalent bond

In a dipole, the arrow is always pointing ______.

• upwards

• to the negative atom

• to the positive atom

• downwards

Answer explanation

A dipole arrow moves from the positive charge to the negative charge